Casio Inc. CTK4400 PPK 61-Key Premium Keyboard Pack with Headphones, Power Supply and Stand Premium keyboard pack comes with Samson HP30 closed-cup headphones, keyboard stand, and power supply 61 piano-look, touch-sensitive keys 600 AHL keyboard voices Hall effect button (at the touch of a button, concert hall reverb can be applied to the sound of the keyboard) 48-note polyphony